diff --git src/wp-admin/includes/dashboard.php src/wp-admin/includes/dashboard.php
index b763d43263..36dc927622 100644
--- src/wp-admin/includes/dashboard.php
+++ src/wp-admin/includes/dashboard.php
@@ -980,7 +980,7 @@ function wp_dashboard_cached_rss_widget( $widget_id, $callback, $check_urls = ar
 		$check_urls = array( $widgets[$widget_id]['url'] );
 	}
 
-	$locale = get_locale();
+	$locale = get_user_locale();
 	$cache_key = 'dash_' . md5( $widget_id . '_' . $locale );
 	if ( false !== ( $output = get_transient( $cache_key ) ) ) {
 		echo $output;